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58 lines
1.9 KiB
58 lines
1.9 KiB
using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Web;
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namespace OpcServerHost
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{
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public class ChatEventHelper
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{
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//定义一个静态对象用于线程部份代码块的锁定，用于lock操作
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private static Object syncObj = new Object();
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//定义用于把处理程序赋予给事件的委托。
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public delegate void ChatEventHandler(object sender, ChatEventArgs e);
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//创建一个静态Dictionary（表示键和值）集合(字典)，用于记录在线成员，Dictionary<(Of <(TKey, TValue>)>) 泛型类
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public static Dictionary<string, ChatEventHandler> chatters = new Dictionary<string, ChatEventHandler>();
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//创建一个静态Dictionary存储设备的最新更新时间
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public static Dictionary<string, DateTime> chatterTimes = new Dictionary<string, DateTime>();
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//定义定时器，不断地检索客户端是否连接
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public static System.Timers.Timer dutyTimer;
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/// <summary>
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/// 开启定时器
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/// </summary>
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public static void StartListenClients()
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{
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dutyTimer = new System.Timers.Timer();
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dutyTimer.Interval = 500;
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dutyTimer.Elapsed += new System.Timers.ElapsedEventHandler(dutyTimer_Elapsed);
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dutyTimer.Start();
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}
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/// <summary>
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///
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/// </summary>
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/// <param name="sender"></param>
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/// <param name="e"></param>
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static void dutyTimer_Elapsed(object sender, System.Timers.ElapsedEventArgs e)
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{
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lock (syncObj)
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{
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foreach (string key in new List<string>(chatterTimes.Keys))
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{
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if (chatterTimes[key].AddSeconds(5) < DateTime.Now)
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{
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chatters.Remove(key);
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chatterTimes.Remove(key);
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}
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}
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}
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}
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}
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}
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